Khoom Paub Txog 304L Stainless Hlau Seamless Pipes
Feb 09, 2026
Tso lus
Txheej txheem cej luam ntawm 304L Seamless Stainless hlau kav
304L stainless hlau seamless yeeb nkab yog cov khoom nyiam tshaj plaws rau kev tuav cov dej uas xav tau kev ncaj ncees, huv si sab hauv thiab txhim khu kev qha corrosion tom qab vuam. L suffix qhia tias qis carbon: qib yog txwv rau 0.030% carbon siab tshaj plaws, piv nrog 0.08% rau tus qauv 304. Thaum cov yeeb nkab yog welded, cov ntsiab lus carbon tsawg txwv cov nag lossis daus ntawm chromium carbides ntawm grain ciam teb nyob rau hauv qhov kub thiab txias ntau yam 425-850 degree, yog li cov khoom tsis cuam tshuam rau corrosion. Qhov no ua rau 304L seamless yeeb nkab ua haujlwm rau tshuaj lom neeg, khoom noj khoom haus, dej haus, tshuaj thiab dej kho cov kav dej.
Chemical Composition thiab Designations
Table 1 piv cov kev cai muaj pes tsawg leeg ntawm lub ntsiab 304L yeeb nkab specifications. ASTM A312 Qib TP304L thiab JIS G3459 SUS304LTP txhais cov khoom siv yeeb nkab, thaum EN 10216-5 npog qib 1.4307 thiab GB / T 14976 npog 022Cr19Ni10.
| Element | ASTM A 312 TP 304L | EN 10216-5 1.4307 |
|---|---|---|
| Cov pa roj carbon (C) | 0.030 max | 0.030 max |
| Manganese (Mn) | max 2.00 Nws | max 2.00 Nws |
| Silicon (Si) | 0.75 max | max 1.00 Nws |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.015 max |
| Chromium (Cr) | 18.0-20.0 | 17.5-19.5 |
| Nickel (Ni) | 8.0-12.0 | 8.0-10.5 |
Cov qauv sib npaug: ASTM A312 TP304L / UNS S30403, EN 10216-5 1.4307, JIS G3459 SUS304LTP, GB / T 14976 022Cr19Ni10.
Mechanical Properties thiab Dimensional Range
Table 2 qhia txog cov kev xav tau ntawm txhua yam. ASTM A312 qhia txog yam tsawg kawg nkaus tensile thiab yield zog rau cov yeeb nkab; EN 10216-5 muab tag nrho tensile ntau yam rau qhov quenched-thiab-tempered lossis txias-draw. Cov ntaub ntawv khoom lag luam rau 304L seamless yeeb nkab feem ntau hais txog kev ua haujlwm siab ntawm 0.6-10 MPa rau cov txheej txheem txheej txheem, tab sis tus qauv tsim qauv (piv txwv li ASME B31.3 lossis GB / T 20801) yuav tsum tau thov rau kev suav tshwj xeeb.
| Khoom | ASTM A 312 TP 304L | EN 10216-5 1.4307 |
|---|---|---|
| Tensile zog | 485 MPa min | 500-700 MPa |
| 0.2% pov thawj muaj zog | 170 MPa min | 190 MPa min |
| Elongation | 35% min | 40% min |
Cov khoom siv ntau yam: sab nraud txoj kab uas hla 6-630 hli, phab ntsa thickness 0.5-30 hli, nrog nruj dua kam rau ua muaj nyob rau hauv qhov txias-dhau.
Cov txheej txheem tsim khoom thiab kev soj ntsuam zoo
Seamless 304L yeeb nkab pib raws li cov khoom siv puag ncig uas yog rhuab thiab tho los ua ib lub plhaub hollow, ces elongated los ntawm kub dov los yog extrusion. Txias dov thiab kos duab txias ua raws qhov nruj me ntsis kam rau ua, cov phab ntsa nyias lossis cov chaw ci ntsa iab, nrog cov tshuaj nruab nrab annealing ntawm 1010-1120℃thiab pickling kom tshem tawm cov nplai. Vim hais tias cov yeeb nkab tsis muaj qhov ntev weld seam, nws muaj cov phab ntsa tuab tuab thiab zam qhov vuam - kev tshuaj xyuas thiab qhov kev pheej hmoo ntawm vuam tsis ua hauj lwm cuam tshuam nrog cov yeeb nkab ntev welded.
Kev tshuaj xyuas thiab kev sim ua raws li tus qauv tswj hwm. ASTM A312 yuav tsum muaj kev sim hydrostatic (los yog qhov sib npaug tsis yog -kev kuaj kev puas tsuaj), ua ke nrog kev sim flattening ntawm qhov ntev xaiv. GB/T 14976 ntxiv cov kev xeem flaring, flaring tom qab flattening, eddy-tam sim no los yog ultrasonic kuaj, thiab intergranular corrosion kuaj ntawm cov qauv. Dimensional checks, phab ntsa- ntsuas thickness thiab soj ntsuam saum npoo yog ua nyob rau hauv txhua txhua yeeb nkab.
Tej kev siv
304L seamless yeeb nkab yog siv nyob rau hauv kev lag luam uas welded kev tsim kho thiab huv kev pab cuam teeb meem: tshuaj thiab petrochemical txheej txheem kab; khoom noj khoom haus, mis nyuj thiab brewery pipelines; tshuaj thiab biotechnology dej systems; cua sov- cov raj xa dej; hydraulic thiab instrumentation kab; kev kho dej thiab desalination nroj tsuag; thiab architectural lossis sanitary tubing. Qhov qis - carbon chemistry ua rau nws tshwj xeeb tshaj yog haum rau nyias- phab ntsa welded piping qhov twg rhiab heev yuav muaj kev pheej hmoo.
Cov lus nug nquag
Q1: L hauv 304L txhais li cas?A1: L sawv cev rau cov pa roj carbon tsawg, txhais tau tias cov ntsiab lus siab tshaj plaws yog txwv rau 0.030%. Qhov no tiv thaiv chromium carbide nag lossis daus thaum vuam, yog li cov yeeb nkab ua kom nws cov corrosion tsis kam tom qab-weld heat treatment.
Q2: Dab tsi yog qhov txawv ntawm 304 thiab 304L seamless kav?A2: Qhov sib txawv tsuas yog cov pa roj carbon ntau, 0.030% rau 304L piv rau 0.08% rau 304. 304L yog qhov zoo dua rau kev pabcuam welded saum toj li 425℃qhov twg tuaj yeem tshwm sim; 304 muaj zog dua me ntsis ntawm qhov kub siab.
Q3: Dab tsi siab tuaj yeem 304L seamless yeeb nkab tiv taus?A3: Lub siab tso cai nyob ntawm sab nraud txoj kab uas hla, phab ntsa thickness, kub thiab tsim code. Cov ntaub ntawv khoom siv feem ntau hais txog 0.6-10 MPa rau cov sijhawm teem sijhawm; Kev suav rau ASME B31.3 lossis GB / T 20801 yog xav tau rau kev tsim tshwj xeeb.
Q4: Yuav ua li cas seamless yeeb nkab txawv ntawm welded yeeb nkab?A4: Seamless yeeb nkab yog pierced los ntawm ib tug khoom billet thiab tsis muaj longitudinal seam, muab lub zog sib xws nyob ib ncig ntawm lub ncig thiab tshem tawm weld - kev soj ntsuam yuav tsum tau. Welded yeeb nkab yog kev lag luam ntau dua nyob rau hauv txoj kab uas hla loj thiab ua haujlwm ntev, thiab tej zaum yuav pheej yig dua rau cov kev pabcuam tsis tseem ceeb.
Q5: Cov qauv twg siv rau 304L seamless yeeb nkab?A5: Thoob ntiaj teb, ASTM A312 (TP304L) thiab EN 10216-5 (1.4307); hauv Nyiv, JIS G3459 (SUS304LTP); nyob rau hauv Suav teb, GB / T 14976 rau seamless stainless cov kav dej rau kev pab cuam. Dimensional kam rau ua yog them los ntawm cov qauv xws li GB / T 17395 qhov twg siv tau.
Q6: Puas yog 304L yeeb nkab xav tau tom qab-weld cua sov kho?A6: Tsis yog. Cov ntsiab lus carbon tsawg ua kom cov cua sov- cuam tshuam thaj chaw tsis muaj sensitizing carbide nag lossis daus, yog li PWHT feem ntau tsis tas yuav muaj kev tiv thaiv corrosion.
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